Class Library calling R Language in C ++

1. Install R and download the source code of R. Click to download the official version of R.
Install R: download and run r-2.10.1-win32.exe from r's website, remember the installation path such as C: \ Program Files \ R \ R-2.15.2.
Download r-2.15.2.tar.gz from r's website, decompress it, copy all the extracted Files to the installation path C: \ Program Files \ R \ R-2.15.2, and select overwrite duplicate Directories
2. Install the corresponding version of Rtools
Run rtools210.exe, select the default installation path, and install all components. Note: select to change the system environment variables.
3. Use MinGW to compile Rmath
3.1 generate Rmath. dll
Use cmd to enter the installation path under C: \ Program Files \ R \ R-2.15.2
Cd C: \ Program Files \ R \ R-2.15-2
Cd src \ include www.2cto.com
Make-f Makefile. win config. h Rconfig. h Rmath.
If an error is reported, ../gnuwin32/MkRules cannot be found. In the corresponding directory, there is a file with the same name. Remove the suffix.
If an rmath. h file cannot be found, copy the file from include to src/include.
Cd ../nmath/standalone
Make-f Makefile. win
Then we can see a large string of compilation output, and see Rmath. dll and Rmath. def in the standalone folder.
 
3.2 generate Rmath. dll
First, to use pexports, install the MinGW plug-in:
(If NO environment variable is set, the command cannot be found :)
Download mingw-utils-0.3.tar.gz (pexports here) and decompress it directly to c: \ Rtools \ MinGW. Run:
 
Pexports Rmath. dll> Rmath. exp
Lib/def: Rmath. exp/out: Rmath. lib
// It seems that the lib command will change the Rmath. exp file, so it can only be executed once. Otherwise, the lib file generated for the second time is incorrect.
// The MACHINE switch is also very important. It must be consistent with the setting of the c ++ project. Otherwise, the load error will be reported during compilation.
 
(Note 1:
 
Here, lib is the command of visual studio C ++. If you cannot find this command, add the bin that installs visual studio C ++ to the environment variable PATH. The method is as follows:
Add C: \ Program Files \ Microsoft Visual Studio 9.0 \ VC \ bin to the Path.
 
NOTE 2: If "mspdb80.dll is not found after running ..... "
 
Copy the file in the visual studio C ++ installation directory, such as msobj80.dll1_mspdb80.dll1_mspdbsrv.exe under C: \ Program Files \ Microsoft Visual Studio 9.0 \ Common7 \ IDE \ in my system to C: \ Program Files \ Microsoft Visual Studio 9.0 \ VC \ bin)
Then we get Rmath. lib.
 
4. Call the Rmath library in the visual C ++ Project
4.1 Build a project
 
Create an empty project on the win32 console, and add Rmath to the project Linker> Additional Dependencies. lib, set Rmath. copy the dll to the project directory and add the following main. cpp to compile and run it:
 
Main. cpp content:
# Define MATHLIB_STANDALONE 1 // macro definition is required, refer to Rmath. h
# Include <Rmath. h>
# Include <stdio. h>
Int main (int argc, char ** argv)
{
Printf ("hello \ n ");
Double x = fmax2 (3, 2 );
Double y = 0;
Printf ("x = % lf", x );
}